Twilight’s Kristen Stewart is lighting things up with a new hair color. The big screen’s Bella Swan has swapped her drab brunette locks for a vibrant red ‘do, which the actress debuted during an appearance on the Late Show with David Letterman Monday. Kristen — who famously snipped her mane for a lead role in the rock biopic The Runaways — says her recent casting in the dramatic film On the Road has prompted her latest style change.

“It’s kind of blond right now. Like, reddish brown. I’m doing it for On the Road,” the star told MTV News overnight.